Abstract
AbstractThe dietary assimilation of a polychlorinated biphenyl (PCB) in adult sea urchins and the effects of maternal transfer of the PCB on sea urchin offspring were investigated and compared to an earlier study where this PCB produced toxicity to developing sea urchin embryos exposed directly through the water route. Adult sea urchins were allowed to graze on sediment spiked with radiolabeled PCB, 2,2′,4,4′‐tetrachlorobiphenyl, for 35 days. The sea urchin L. pictus was found to have a high pollutant extraction efficiency; approx. 62% of the bulk PCB sediment concentration is removed while passing through the gut. Maternal transfer of PCB 2,2′,4,4′‐tetrachlorobiphenyl did not prove to be a more sensitive exposure route to developing embryos than the direct water route. Both adult sea urchins and their offspring were found to be resilient to the effects of this PCB at environmentally relevant sediment concentrations and at levels expected on the basis of the critical body residue theory or the model of narcosis. Low toxicity of PCBs to sea urchins at different life stages allows for significant bioaccumulation in sea urchins.
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